usermode capable kernel with logging syscall

1 files changed, 70 insertions, 0 deletions

diff --git a/arch/x86_64/idt.c b/arch/x86_64/idt.c
new file mode 100644
index 0000000..567dead
--- /dev/null
+++ b/arch/x86_64/idt.c
@@ -0,0 +1,70 @@
+#include "tables.h"
+#include "cpu.h"
+#include "lib/jove.h"
+#include "io/log.h"
+
+PAGEALIGN
+static struct InterruptTrapGate s_idtd[48];
+static struct InterruptState *(*s_int_handlers[48])(struct Registers*);
+static struct XDTR s_idtr = {
+    .length = sizeof(s_idtd) - 1,
+    .address = (uintptr_t)&s_idtd
+};
+
+uint64_t __isr_err;
+uint64_t __isr_num;
+
+struct Registers*
+irq_handle(struct Registers *state)
+{
+    if(__isr_num < 48) {
+        if(s_int_handlers[__isr_num] != NULL) {
+            s_int_handlers[__isr_num](state);
+            return state;
+        }
+    }
+    klogf("Interrupt %i\nerror code %#016X\n", __isr_num, __isr_err);
+    klogf("IP:  %#016X\n", state->ip);
+    klogf("AX:  %#016X\n", state->ax);
+    klogf("BX:  %#016X\n", state->bx);
+    klogf("CX:  %#016X\n", state->cx);
+    klogf("DX:  %#016X\n", state->dx);
+    klogf("SI:  %#016X\n", state->si);
+    klogf("DI:  %#016X\n", state->di);
+    klogf("BP:  %#016X\n", state->bp);
+    klogf("R8:  %#016X\n", state->r8);
+    klogf("R9:  %#016X\n", state->r9);
+    klogf("R10: %#016X\n", state->r10);
+    klogf("R11: %#016X\n", state->r11);
+    klogf("R12: %#016X\n", state->r12);
+    klogf("R13: %#016X\n", state->r13);
+    klogf("R14: %#016X\n", state->r14);
+    klogf("R15: %#016X\n", state->r15);
+    kpanic("Unhandled exception\n");
+    return state;
+}
+
+extern void x86_64_lidt(struct XDTR *idtr);
+void
+x86_64_load_idt(void)
+{
+    extern uintptr_t __isr_stubs[22];
+    for(int i = 0; i < 22; i++)
+    {
+        uintptr_t base = __isr_stubs[i];
+        klogf("INT %2i : %#016X\n", i, base);
+        s_idtd[i] = (struct InterruptTrapGate){
+            .base_0_15 = (base & 0xFFFF),
+            .segment_selector = 0x10,
+            .ist = 0,
+            .zero_0 = 0,
+            .type = 0xE,
+            .zero_1 = 0,
+            .dpl = 0,
+            .p = 1,
+            .base_16_31 = (base >> 16) & 0xFFFF,
+            .base_32_63 = (base >> 32) & 0xFFFFFFFF
+        };
+    }
+    x86_64_lidt(&s_idtr);
+}